daftmike, an avid gamer, built his own version of a mini NES using a 3D printer, a Raspberry Pi mini computer, and some NFC chips; and it all comes complete with a fully functional cartridge slot. It somehow gets better though...using an app on his phone he can reprogram each cartridge on the fly.

This dude's comment on the original video perfectly sums up how I'm feeling about all this right now: